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Significant accounting policies - Acquisition of controlling interest (Details) - Tuves Paraguay - Nucleo ₲ in Millions, $ in Millions | Apr. 11, 2017 shares | Jun. 30, 2017 PYG (₲) | Jun. 30, 2017 ARS ($)
--- | --- | --- | ---
Acquisition of controlling interest |  |  |
Percentage of voting equity interests acquired |  | 70.00% | 70.00%
Cash payment |  | ₲ 35 | $ 0.1
Partial capitalization of receivables |  | 49,396 | 147.0
Total purchase price |  | 50,056 | 149.0
Goodwill |  | ₲ 662 | $ 2.0
CONATEL Resolution No. 460/17 |  |  |
Acquisition of controlling interest |  |  |
Number of shares acquired | 350 |  |
Percentage of voting equity interests acquired | 70.00% |  |

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